Development of novel photocatalysts with a metastable phase being active for water splitting

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14770
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Tokyo University of Science
• Principal Investigator: Yamaguchi Yuichi 東京理科大学, 理学部第一部応用化学科, 講師 (30843122)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: 光触媒 / 水分解 / 可視光

Outline of Final Research Achievements

The rapid cooling treatment using liquid nitrogen to synthesized AgTaO3 was carried out. As a result, the split of XRD patterns of the treated AgTaO3 was suppressed compared to the non-treated sample, suggesting the change of the crystal phase by rapid cooling treatment.
Sacrificial oxygen evolution over AgMVO4(M=Mg,Ca,Mn,Zn) and Ag2Zn(VO3)4 was evaluated under visible light irradiation. The samples except for AgMnVO4 showed the activities. In particular, AgMgVO4 showed the highest activity among the evaluated samples.

Free Research Field

光触媒

Academic Significance and Societal Importance of the Research Achievements

合成したAgTaO3を急冷処理を施すことで結晶構造の歪みを解消することができる可能性が示唆された．まだ詳細なキャラクタリーゼーションが必要な段階ではあるが，通常の加熱・降温処理では得られない新規材料が合成できる可能性に期待がもたれる．
また，新規の可視光酸素生成光触媒としてAgMVO4(M=Mg,Ca,Zn)およびAg2Zn(VO3)4を開発することができた．なかでもAg2Zn(VO3)4は可視光領域のほぼ全域の波長を吸収することができる点において有望である．最終的な目標である太陽光を有効に利用できる可視光酸素水素生成光触媒の開発に期待がもたれる．